P082BGear Lever X Position Sensor 1 Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- Gear lever X and Y position sensors detect a selector's position in two directions: on an H-gate shift and select direction (a LuK patent uses two sensors about 90° apart), on a shift-by-wire lever its two axes. P0820 covers the whole X-Y circuit, P0821–P0824 and P082A–P082F sensor 1, P089A–P08A3 a redundant sensor 2. GM uses P082A–P082F on its electronic range selector (2019 tables, Cadillac XT4, 2025): a Hall sensor delivers a PWM signal, measured as duty cycle. P082B means the duty cycle of X sensor 1 is too low – the signal stays near 0 %, a short to ground or a sensor without supply. GM sets it below 17 % with 3 of 4 samples of 25 ms (2019) or below 5 % with 10 of 12 samples (2025), type B with the MIL after two trips. Sensor 2 then takes over; if both fail, park is selected, as GM's patent describes.
- What you may notice
- Check engine lamp after two trips (GM)
- 'Shift to park' message or transmission warning
- Range selection restricted; with both sensors failed the vehicle goes to park
- Likely causes
- LikelySignal wire shorted to ground
- PossibleSensor supply open
- PossibleSensor in the selector assembly faulty
- RareControl module
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.